Electric cable



(No Model.)

H. A. CLARK.

ELECTRIC CABLE.

No. 311,174. Patented Jan. 27,1885.

WAN/Wawy munt@ QCAYx nvxwYn/v MM 'f .Y WN' y UNITED STATES PATENT OFFICE.

HENRY A. CLARK, OF BOSTON, MASSACHUSETTS.

ELECTRBO IIIABLE..

SPECIFICATION forming Dart of Lettere Patent. No. Slklfli, dated January 27. 1885.

Application l `d April 24, 1884.

' To all when it maycancern.-

Be it known that I, HENRY A. CLARK, ef Boston, in the county of Suffolk and State of Massachusetts, haveinvented certain new and useful Improvements in Electric Cables, et' which the following is a full, clear, and exact description.

This invention relates to a cable for tele` phonic, telegraphie, and' electric purposesv and to the construction and arrangement oi' such a cable that its electric cond uctingwires will be suitably insulated, and in its use induction andleakagebvercome; and theinventron consists of awire or, Wires of iron. copper, orof any suitable electric conducting inaterial surrounded by a series or layer ot' electric conducting-Wires, one or more of which wires are bare wires and the others insulated wires, which series or layer of insulated wires and bare wires are covered with an electric conducting material which in turn is covered with anysuitable insulating material and with or wit-hout an outside covering of any suitable protecting material, all substantially as hereafter fully described.

It also consists of a wireor wires of iron, copper, or of any suitable electric conducting material .surrounded by a series or layer of electriccondueting-wires oneor more ot'which wires are bare Awires and the others insulated wires, which wires are covered' with any suit.

able insulating material andv with or without- .'an outside covering ot any suitable protect-ing material, all substantially as hereinafter fully described.

It also consists of a wire. or wires of iron, copper, or of any suitable electric conducting material surrounded by a series or layer ot' electric conducti ng-wires, one or more 0l' which wires are bare wires and the others insulated wires, which series or layer ot' insulated wires and bare wires are coveredwith an electric conduct-ing material, which in turn is covered with another similar series or layer of insulated and bare wires, and then covered with any suitable insulating material and with or without an 'outside covering of any suitable protectingmaterial, all substantially as hereinater fully described.-Y

It also consists of`a wire or wires of iron, copper, or any suit-able electric conducting mame model.)

terial surrounded by a series or layer of electric conducting-Wires, one of more of which wires are bare Wires and the others insulated Wires, which series er layer of insulated wires and bare Wires are covered with another similarseries or layei` of insulated wires and bare wires. and 'than covered with an electric conducting niateriai, in turn covered with any suitable insulating material and `with or Without an outside notering of any suitable protecting material, all substantially as hereinafter i'ully described.`

in the accompanying plate of drawings is ilinstrated an electric cable constructed according to this invention, Figures L4, and 7 representing such an electric cable in side View. with its several layers and coverings exposed to view. Fig. 2 is a cross-section of Fig. i. Fig. 5 is a crossseciion similar to Fig.2, but showing a modification. Fig. ti is a cross-section siinilar'te Fig. 5, but showing a modification. Fig. 8 is a crosssection of Fig. 7; and Fig. 9 is a cross-section similar to Fig. 8, but showing a naodication. I

in the drawings, A represents a center Wire, of iron, copper, or of any suitable electric conducting material; and D, a series or layer ot electric conducting-wires composed of insulated wires C and a bare wire, D, the insulated wires being insulated, in any suitablemanner, separately and independently of each other. As shown in Figs. l and 2, these insulated wires Gand the bare wire D are spirally wound around the center wire, A, and are ot' a number and size to closely surround the wire A, as shown. Over this layer ot' insulated wires C anfi bare wire D is wound, preferably in spiral form, a strip or sheet, E, of metal, preferably of tin-foil, and over this tin-foil is a coating-or'coxv'ering, F, -ot any suitable insulating material-such as iudia-rubber or gatta-percha, each either alone or combined with each other or in any of their compounds-and over this insulated material is a covering, G, of cot ton or other suitable fibrous material, braided -or Woven or 4wound thereon, or in any suitable manner.

In Fig. 3 is shownA in cross-section a cable constructed like Figs. 1 and .2, buthaving in lieu of one bare wire D four bare Wires D.

In Figs. 4 and 5 is shown a cable constructed like that shown in Figs. 1 and 2, except that the covering E, of tin-fol,- is dispensed with, and the insulated material Fvcovered directly onto the layer B of insulated wires and bare W'.

lin Fig. 6 is shown in cross-section a cable constructed like that shown in Figs. 4 and 5, but having four' bare wires in lieu ot" one.

in Figs. 7 and 8 is shown a cable having a center wire, A, surrounded'b-y the series B ot' insulated 'wires and bare wire covered with tin-foil E, which in turn issurrounded by another series or layer, H, of insulated wires C- and va bare wire, D, but in a spiral direction opposite to the series B, this second series. H. being covered with the insulating material F an'd-braid G, as before.

ln Fig. 9 is shown in cross-section an electric cable similar to that showntiu Figs. 7 and 8, lbut with the second series or layer, lL ot' insulated wires and bare wire wound direct-ly upon the series B, and having the electric conducting material E, over the series H, in turn covered with the insulating material F and outside protecting-braid, G.

The several wires C can he insulated in any suitable manner, and with any suitable insulating material; also, in 4lieu o t tin-foil a sheet or strip of any suitable electric conducting material can be used, and it can be applied in anysuitablennanner; also, the iusuiating' material F can be ot any suitable insulating, material; also, the'braide'd covering can be ot' any suitable material, and applied thereto by braiding it thereon, as shown, or b v weaving it or winding it thereon, o'rotherwise, and the center wire can be one-or more wires of suitable electric conducting material.

Either the center wire or the bare Wire or the tin-foil, or all can be connected, when using the cable, vto the ground by any suitable elec-l tric conducting material to obviate induction and leakage.

The advantage of having one or more bare wires with the insulated wires, as shown, is that, if desired to connect the center wire, A, with, the ground at any particular place, except at its end, the bare wire itself or the tinfoil can b e connected by a suitable electric conducting-wire to the ground, and as the bare wire is always in contact with the center wire and the tin-foil in cont-act with the bare wire, the grounding of the cable for the better prevention of induction and leakage will be insured, and that without disturbing the insulated wires.

It is preferable and necessary to have the i'oil in close contact with the bare wire or wires, and the bare wi-re or wires in close trical connection between the three; also, one or more bare wires can be used, although probably one bare wire will be suicient for general purposes; also, the wires insulated as well as bare can be laid spirally, as shown, or longitudinally, or as desired.

Having thus described my invention, what I claim is l. An electric conducting-cable composer of a center electric conducting wire or wires surrounded by a series or layer of electric conducting wires` one or more of' which wires are bare wires and the rest insulated wires, which are covered with an electric conducting material and an outside protecting-c0ver in g, substantially as and for the purpose speci.- ed.

2. An electric conducting-cable composed ot acenter electric conducting wire or wires surrounded by a series or layer ot electric conducting wires, one or more of which wires are bare wires and the rest insulated wires,

said series or layer bein ,q covered with an electric conducting material` which is covered with an insulating-material and with an outside protecting-covering. substantially as and for the purpose specified.

3. An electric conducting-cable,composed of a center electric conducting wire 0r wires surrounded by a series or layer 0f electric conducting-wires, one or more of which wires are bare wires and 'the rest insulated wiresl said series or layer being covered with an electric conducting material, which is sur rounded by another series .or layer ot insulated wires and one or more .bare wires, said Second series or layer being lcovered with an electric conducting material covered with an insulating-material and withan outside pro'- tecting-covering, substantially as and for the purpose specified.

4. An electric conducting-cable composed ot a center electric conducting wire or wires; surrounded by a series or layer of electric conducting-wires, one or lmore of which lwires are bare wires and the rest insulated wires, in turn covered with'a second series or layer of insulated wires and bare wire or wires, said second series or layer being covered with an electric conducting material which is covered with an insulating material and with au outside protecting-covering, substantially as and for the purpose specified.

In testimony whereof I have hereuntc set my hand in the presence of two subscribing witnesses.

. HENRY A. CLARK. Witnesses:

EDWIN W. BROWN,

contact with the center wire, to insure elecl WM. S. BELLows.

Ils 

